a justifiable defense

• 正当的自卫

a justifiable defense的用法和样例：

例句

1. The defense mechanism which can make us immune to certain diseases also makes us "immune" to other people's organs and tissues.
   使我们对某些疾病产生免疫力的自卫机能也能使人们对别人的器官或组织产生排外性。